Common Core: 1.NBT.B.2
Problem 16 of 27g1-016
Each long rod is 10 blocks. There are 4 rods and 7 little ones. How many blocks are there in all?
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Solution walkthrough0:51
- One long rod is 10 little blocks: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
- Count the rods by tens: 10, 20, 30, 40. 4 tens make 40.
- Now the ones. Keep counting from 40: 41, 42, 43, 44, 45, 46, 47.
- Say the tens first, then the ones: 4 tens and 7 ones make 47. Great counting!